The problem lies with the words "game" and "art". If you type these words into a number of online dictionaries you will get several dozen definitions, which fact should immediately make you suspicious of whether there is any generally accepted definition at all. The short answer is there isn't. Some of mankind's greatest minds have tried defining what a game is and failed, while on the other hand the word "art" is used in so many different contexts that the only thing we are expected to understand when someone refers to something as art is that they are praising it. Like "democracy" and "terrorism", two other popular words that have yet to be clearly defined (and probably never will), the word "art" is often used in a consciously dishonest way. Again from Orwell:
"The words democracy, socialism, freedom, patriotic, realistic, justice have each of them several different meanings which cannot be reconciled with one another. In the case of a word like democracy, not only is there no agreed definition, but the attempt to make one is resisted from all sides. It is almost universally felt that when we call a country democratic we are praising it: consequently the defenders of every kind of regime claim that it is a democracy, and fear that they might have to stop using that word if it were tied down to any one meaning."
So getting back to the question "Can games be art?" (which to make sense of we now read as "Can games be good?"), the only acceptable answer to this question would be, "Of course, and so can anything." Music, movies and even food can be art (but only good music, movies and food). Books can be art (but only good books, and we even have a fancy name for them: we call them Literature). War can be art (The Art of War). Sex can be art (The Art of Love). Even my cock can be art when I am in the right mood, et cetera, et cetera.